文献类型：会议论文

英文题名：Destabilization of reversed shear Alfven eigenmodes driven by energetic ions during NBI in HL-2A plasmas with qmin ～ 1

作者：Hl-2A Team[1];Chen, W.[1];Yu, LiMin[2];Liu, Yi[1];Ding, X. T.[1];Xie, H. S.[3];Zhu, J.[3];Yu, L. M.[1];Ji, X. Q.[1];Li, J. X.[1];Li, Y. G.[1];Yu, D. L.[1];Shi, Z. B.[1];Song, X. M.[1];Cao, J. Y.[1];Song, S. D.[1];Dong, Y. B.[1];Zhong, W. L.[1];Jiang, M.[1];Cui, Z. Y.[1];Huang, Y.[1];Zhou, Y.[1];Dong, J. Q.[1];Xu, M.[1];Xia, F.[1];Yan, L. W.[1];Yang, Q. W.[1];Duan, X. R.[1]

机构：[1]Southwestern Inst Phys, Chengdu 610041, Peoples R China;[2]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[3]Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Zhejiang, Peoples R China

会议论文集：13th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems

会议日期：SEP 17-20, 2013

会议地点：Peking Univ, Fus Simulat Ctr, Beijing, PEOPLES R CHINA

主办单位：Peking Univ, Fus Simulat Ctr

语种：英文

外文关键词：frequency sweeping modes; RSAE; Alfven continuum; energetic ions

摘要：Two groups of frequency sweeping modes are observed and interpreted in the HL-2A plasmas with q(min) similar to 1. The tokamak simulation code calculations indicate the presence of a reversed shear q-profile during the existence of these modes. The mode frequencies lie in between TAE and BAE frequencies, i.e. omega(BAE) < omega < omega(TAE), and these modes are highly localized near q(min), i.e. r/a similar to 0.25. A group of modes characterized by down-sweeping frequency with q(min) decrease due to q(min) > 1 and nq(min) - m > 0, and another group of modes characterized by up-sweeping frequency with q(min) drop, owing to q(min) < 1 and nq(min) - m < 0 before sawtooth crash. The kinetic Alfven eigenmode code analysis supports that the down-sweeping modes are kinetic reverse shear Alfven eigenmodes (KRSAEs), and the up-sweeping modes are RSAEs, which exist in the ideal or kinetic MHD limit. In addition, the down-and up-sweeping RSAEs both have fast nonlinear frequency behaviour in the process of slow frequency sweeping, i.e. producing pitch-fork phenomena. These studies provide valuable constraint conditions for the q-profile measurements.